Just like the Hawaiian spot has left a chain of islands and sea mounts in its wake, the Yellowstone hotspot is -- slowly -- on the move.
IIRC, there was another spot that moved through the southern U.S. and broke the then extant mountain chain that curved westward from the current Appalachian chain. The famous open-air "you pick it" diamond mine in Arkansas might be attributable to it.
On a separate note, its National Aeronautic and Space Administration. Not just "Space". The next time some political bozo complains about the Earth "not being its mission. As well, studying the Earth provides NASA and others insight into what they encounter and will encounter on other planets -- out there in space. Meaning not just direct visitations, but also interpreting collected signals (telescopes et al.)
Anyway, in addition to that, I'm glad SOMEBODY is studying the Earth. We didn't develop our modern society by turning away from the facts and experience in front of our eyes.
There's a good display of this at one of the visitors centers within the park.